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Re: need to test K250-1 [message #28378 is a reply to message #28377]

Sat, 06 November 2021 15:38

coatikid
Messages: 4
Registered: November 2021

Junior Member

Thank you for the reply. Here is an update.

The fuse appears to be intact/not blown. Interesting to note the fuse is soldered in directly not clipped into a fuseholder.

The amp powers up. The polarity button lamp lights up, but not the power button lamp. There is a barely audible hum which appears to be coming the transformer.

I plugged in a 1/4" plug with hard wire leads into the 3 Ohm to 4 Oh output. Set my Klein Tools multimeter to DC Voltage, connected the leads and got a reading of 40.8 volts.

I connected the amp output to a Roland cab with a Sunn speaker rated at 150 watts. Powered up the amp and got a loud hum from the speaker.

Kinda looks like the output stage of the amp is indeed bad.

It would be great to get this vintage piece back on its feet, although my technical skills are limited and the learning curve would be considerable for me. I'm in Tucson and there are only 1 or 2 people in town I am aware of that do this kind of work and they are usually swamped. Will keep looking.

Any suggestions or insights will be greatly appreciated. Thank you.

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[Message index]

		need to test K250-1 By: coatikid on Fri, 05 November 2021 04:42
		Re: need to test K250-1 By: stevem on Fri, 05 November 2021 06:09
		Re: need to test K250-1 By: coatikid on Sat, 06 November 2021 15:38
		Re: need to test K250-1 By: stevem on Sat, 06 November 2021 17:59
		Re: need to test K250-1 By: coatikid on Fri, 19 November 2021 01:31
		Re: need to test K250-1 By: coatikid on Mon, 22 November 2021 20:17
		Re: need to test K250-1 By: stevem on Sat, 20 November 2021 06:15
		Re: need to test K250-1 By: stevem on Sat, 20 November 2021 06:25
		Re: need to test K250-1 By: stevem on Sat, 20 November 2021 06:28
		Re: need to test K250-1 By: stevem on Wed, 24 November 2021 12:31

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